I love the MIC hi/lo segment; the step segment I find a little moderate, although after 35 minutes of hi/lo maybe you need a bit o' lighter.
There is a floor warm-up, low-impact, medium-impact and then all-out hi-impact development in the first 35 minutes. The high impact portion (approximately 15 minutes long, beginning about 18:35 minutes into the workout), is replete with jumps, high kicks, hi-knee lifts, plyo jacks, plyo heel digs (which I've never mastered; I substitute power scissors / explosive lunges) and my beloved high-knee runs.
The step segment has well-cued and well-built-up choreography that she pulls together into these long strings (having given you plenty of practice time), and ends with a mini-interval blast.
I think there's certainly a place for it in your library. The high-low doesn't vault you into the stratosphere as quickly as Circuit Max does, but it's well worth it.
A-Jock